PURPOSE
Reorganize and lint mail.channel code. Purpose is to ease future modifications
linked to groups and channels in mail / Discuss.
SPECIFICATIONS
Purpose is to better spot future query counter updates by ensuring current
thresholds effectively match runbot state. Some query counters for admin
are currently a bit lower than expected, probably linked to various ORM
improvements and cleaning done since last counter update.
LINKS
Prepares Task ID-2070632 (Discuss channel task)
Prepares Task ID-2419762 (SM channel task)
COM PR odoo/odoo#64862
Thibault Delavallée
b690b3f455